function inject_unount(target) {
    // 改装componentWillUnmount，销毁的时候记录一下
    let next = target.prototype.componentWillUnmount
    target.prototype.componentWillUnmount = function () {
        if (next) next.call(this, ...arguments);
        this.unmount = true
    }
    // 对setState的改装，setState查看目前是否已经销毁
    let setState = target.prototype.setState
    target.prototype.setState = function () {
        if (this.unmount) return;
        setState.call(this, ...arguments)
    }
}
export default inject_unount